Studious Investigation Into a Topic or Problem
Puzzle 1 of Handmade Gifts Easy Pack
Question is: Studious Investigation Into a Topic or Problem
and the answer is: RESEARCH
Word Meaning:
RESEARCH — (uncountable, countable in some dialects) Diligent inquiry or examination to seek or revise facts, principles, theories, applications, etc. (that are currently available, or that are familiar to one's self).
Definitions from Wiktionary.